handlers.py 文件源码

def check_for_200_error(response, **kwargs):
    # From: http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectCOPY.html
    # There are two opportunities for a copy request to return an error. One
    # can occur when Amazon S3 receives the copy request and the other can
    # occur while Amazon S3 is copying the files. If the error occurs before
    # the copy operation starts, you receive a standard Amazon S3 error. If the
    # error occurs during the copy operation, the error response is embedded in
    # the 200 OK response. This means that a 200 OK response can contain either
    # a success or an error. Make sure to design your application to parse the
    # contents of the response and handle it appropriately.
    #
    # So this handler checks for this case.  Even though the server sends a
    # 200 response, conceptually this should be handled exactly like a
    # 500 response (with respect to raising exceptions, retries, etc.)
    # We're connected *before* all the other retry logic handlers, so as long
    # as we switch the error code to 500, we'll retry the error as expected.
    if response is None:
        # A None response can happen if an exception is raised while
        # trying to retrieve the response.  See Endpoint._get_response().
        return
    http_response, parsed = response
    if _looks_like_special_case_error(http_response):
        logger.debug("Error found for response with 200 status code, "
                     "errors: %s, changing status code to "
                     "500.", parsed)
        http_response.status_code = 500